Maxaud

(NOTE: Before saying this plugin is broken, please understand what this plugin does. It’s meant for WordPress installs that have multiple NETWORKS.)
Adds the ability to have different themes available to different NETWORKS in a multisite atmoshpere.
WordPress allows for multiple “networks”, these are not to be confused with sites. A network holds blogs underneath of it.
This plugin will allow you to separate themes into different directories so they’re only accessable and viewable to the networks you choose.
The plugin will attempt to create a directory in the /wp-content/ directory named /ms-themes/. If it fails to create it, then you will need to make one.
In the /ms-themes/ directory you will create a folder for each network that you want to allow only certain themes to.
Example: 
If you have a theme named “Snarfer Theme”, and you want to only allow it to be viewable/available to the network (and all sites on that network) with the site_id of 7, you would place the snarfer theme directory in /wp-content/ms-themes/7/
Future releases:
<ul>
<li>Network option to turn off auto creation on/off network directories, index.php files.</li>
<li>Network option to display network ID in the footer of sites so network admins can easily tell what network a site is under.</li>
</ul>

Multisite Themes

Adds the ability to have different themes available to different NETWORKS in a multisite atmoshpere.

kodeala

The “Reorder Multisite Sites Dropdown” plugin empowers administrators of multisite WordPress installations with a simple yet powerful solution to customize the ordering of the “My Sites” dropdown menu within the Admin Bar. Installing and setting up the plugin is straightforward. Once the plugin is added to your WordPress installation, navigate to the Network Admin area and locate the “Reorder My Sites” option under Settings, rearrange the sites according to your preferences through the drag-and-drop interface. After customizing the order to your satisfaction, finalize the changes by clicking the “Save Changes” button.

Reorder Multisite Sites Dropdown

The "Reorder Multisite Sites Dropdown" plugin empowers administrators of multisite WordPress installations with a simple yet powerful soluti …

Multisite Themes vs Reorder Multisite Sites Dropdown